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G- reatest C- ommon F- actor

Easy Problem: What is the GCF of 2 and 4
Answer: 12

Easy Problem:What is the GCF of 4 and 8
Answer: 16

Hard Problem: What is the GCF of 9 and 20
Answer: 180

Hard Problem: What is the GCF of 20 and 40
Answer: 800

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